/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package studio.raptor.ddal.core.connection.jdbc.pool;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Wrapper;

/**
 * This is the proxy class for java.sql.ResultSet.
 *
 * @author Brett Wooldridge
 */
public abstract class ProxyResultSet implements ResultSet {

  protected final ProxyConnection connection;
  protected final ProxyStatement statement;
  protected final ResultSet delegate;

  protected ProxyResultSet(ProxyConnection connection, ProxyStatement statement,
      ResultSet resultSet) {
    this.connection = connection;
    this.statement = statement;
    this.delegate = resultSet;
  }

  final SQLException checkException(SQLException e) {
    return connection.checkException(e);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public String toString() {
    return new StringBuilder(64)
        .append(this.getClass().getSimpleName()).append('@').append(System.identityHashCode(this))
        .append(" wrapping ")
        .append(delegate).toString();
  }

  // **********************************************************************
  //                 Overridden java.sql.ResultSet Methods
  // **********************************************************************

  /**
   * {@inheritDoc}
   */
  @Override
  public final Statement getStatement() throws SQLException {
    return statement;
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void updateRow() throws SQLException {
    connection.markCommitStateDirty();
    delegate.updateRow();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void insertRow() throws SQLException {
    connection.markCommitStateDirty();
    delegate.insertRow();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void deleteRow() throws SQLException {
    connection.markCommitStateDirty();
    delegate.deleteRow();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  @SuppressWarnings("unchecked")
  public final <T> T unwrap(Class<T> iface) throws SQLException {
    if (iface.isInstance(delegate)) {
      return (T) delegate;
    } else if (delegate instanceof Wrapper) {
      return delegate.unwrap(iface);
    }

    throw new SQLException("Wrapped ResultSet is not an instance of " + iface);
  }
}
